The phenomenon in which some female coral reef fish spontaneously transform into males if the dominant male is removed is known as
A) Arrhenotoky.
B) Protandry.
C) Protogyny.
D) Thelytoky.
Answer: C
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During implantation, the
A) trophoblast erodes a path through the endometrium. B) inner cell mass begins to form the placenta. C) maternal blood vessels in the endometrium are walled off from the blastocyst. D) entire trophoblast becomes syncytial. E) inner cell mass is temporarily deprived of nutrients.
Using the figure below, identify the location where each process occurs.
1 Pockets pinch off, forming endosomes known as coated vesicles.
2 Coated vesicles fuse with primary lysosomes to form secondary lysosomes.
3 Target molecules (ligands bind to receptors in plasmalemma.
4 The endosome fuses with the plasmalemma, and the receptors are again available for ligand binding.
5 The lysosomal and endosomal membranes separate.
6 Areas coated with ligands form deep pockets in plasmalemma surface.
7 Ligands are removed and absorbed into the cytoplasm.
Which of the following is not a determinant of whole muscle tension?
a. the number of muscle fibers contracting. b. the tension produced by each contracting fiber. c. the extent of motor-unit recruitment. d. the frequency of stimulation. e. the proportion of each motor unit that is contracting at any given time.
Which of the following is the deepest abdominal muscle?
A) external oblique B) internal oblique C) transversus abdominis D) rectus abdominis